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Updated: January 21, 2005

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2


Serial Line Internet Protocol (SLIP) is an older remote access standard typically used by UNIX remote access servers. Network Connections supports SLIP for dial-up connections.

When you connect to a SLIP server, a Windows Terminal dialog box appears for an interactive logon session with the UNIX SLIP server. The UNIX logon overrides and prevents the remote access logon session from appearing. After a connection is established, remote network access becomes transparent to the user.

The RFCs supported in remote access are:

  • RFC 1055, "A Nonstandard for Transmission of IP Datagrams Over Serial Lines: SLIP"

  • RFC 1144, "Compressing TCP/IP Headers for Low-Speed Serial Links"

For information about configuring a network or dial-up connection, see Configure a connection to a remote network.


  • Microsoft® Windows® XP does not support SLIP for incoming connections.

  • You must use the TCP/IP protocol and a serial COM port to connect to a SLIP server.

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